Sash operator for greenhouses



Oct. 23, 1928.

T. E. KING SASH OPERATOR FOR GREENHOUSES Filed Nov. 4, 1924 mvayron FFdu/wrd El 719' BY M o- M ATTORNEY! Patented Oct. 23, 1928.

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' Application filed November 4,;1924. Serialld'o. 747,730.

This invention relates to improvements in sash operator for greenhouses, and has for: its object the provision of simple, eihcient, and

inexpensive means for overcoming the inertia ging, due to the torsional strain upon the shaft, and the present invention, in providing means for counter-balancing the weight ofthe sashes, overcomes the torsional strains referred to and accomplishes these results in a simple manner and gives assurance that the sashes will be simultaneously raised and lowcred as the shaft rection. Y r V In the accompanying drawlngs Figure 1 13 is turned in the proper dipartly in section and partly in elevation, and

shows my invention applied tothe operating parts ofone of the sashes;

Figure 2 is a plan view showing the invention applied to two of a bank of sashes. Referring to the drawings which are merely illustrative of the invention, 1 designates the usual sash frame of a conventional greenhouse upon which are hinged a bank or banks of sashes 2, one of which is shown in the draw ings hingedat 3 to the frame 1. A plurality of hangers l are severally secured to the-rafte'rs 4/ and serve to support rotatably a sashoperating shaft 5, upon which is operatively secured, longitudinally, as many toggles as are required to raise and lower the sashes to open or closed position. The number of toggles required to each sash depends on the size of the latter; usually there are two toggles to a sash, and sometimes there are three. Each toggle consists of two arms 6 and 7, and these form a leverage to raise and lower the sashes, the arm 6 being connected. hingedly at 8 to the outer end of the sash and the arm 7 being rotaably secured to the shaft 5, and both arms pivotably connected at 9. An elongated spiral spring 10 is secured at one end to the rafter 1 and at its opposite end is connected to the hook 11 of a lover or arm 12, fixedly secured to shaft- 5. It will be understood that for each sash there is mounted upon the shaft 5 aseparate arm 12, the latter preferably projecting substantially at right angles to the arm 7 In operation, when by proper actuat-ing.

connections {not shown) the shaft 5 is, manuallyturned orrotated: (assuming the sash to be in closed position as'shown'in full linesin the drawings) the arms 6 and 7 move upwardly to the positions'indicated in dotted lines, thereby raising the sash to its full open position. The spring 10 has a differential movement: (1) The force exerted by it when the sashes are closed and the arm 12 is in its full line position is nil, so far as concerns the rotation of the shaft 5 and its tendency toopen the sashes, because the arm 12 is turned out of the line of force exerted bythe spring; but (2) as the shaft 5 is rotated'b-y the operator to raise the sashes, the arm 12 also rotates, and, moving downwardly, is brought into the line of force of the spring 10, thereby carrying the load for the operator over the most difficult part sashes.

It is obvious that with such a spring mechanism mounted on the shaft for eachof the sashes, the torsional strain upon the shaft will important that there should be no accidental opening of the sashes when in closed position, and this iseffectively provided against by turning the arm 12 into inoperative position, as above indicated.

Having described my invention, what I claim is: i

1. In a device of the class described, the con'ibination of asas'h frame, a pluralityof sashes movably connected thereto, a toggle connected to each sash. a shaft, each toggle being operated by said shaft to raise'and lower said sashes, a rock-arm on said shaft, at each sash. an elongated spiral spring for each sash and being secured at one end tosaid frame and at the other end to said rock-arm, said rock-arm being so positioned as to carry said spring into inoperative position when said sash is closed and to carry it. into operative position as said shaft is operated to open thesash...

2. In a device of the class described, the combination of a sash frame, a plurality of sashes movably mounted therein, a shaft extendingcontinuously under said sashes, a link hingedly connected to each of said sashes,

of the operation of opening the arms rotatably mounted on said shaft, each having its extremity pivotally connected. with eachv link, second arms carried by said shaft 'and' arranged at an oblique angle With respect nal axis of said shaft When in inoperative'po -8. In a deviceofthe class described;

.combinationof'a sash-frai'ne, a plurality of sashes 'hingedly mounted thereon, a continuous shaft ad acent thereto, means connected tosaid shaft, and to'said sashes for opening and closing the latter on said frame, and dif- 'ferential' spring mechanism connected to said shaft and to said sash-frame for counter-balancing' the action of said sashes and so arranged that 1t 18 automatically shlfted lnto inoperative 'POSlillOIl When saidsashes are closed. p I

4.1m a device of theclass described5 the combination of a sash-frame, a plurality of sashes mounted thereon, a shaft, meanscoir nected to said shaft and to saidsashes for opening and closing thelatter on said frame, andv diiferential spring means connected'to said'shaft' and to said sash-frame for counterbalancing the action of said shaft.

T. EDWARD KING. 

